Cholecystokinin-A receptor ligands based on the .kappa.-opioid agonist tifluadom
作者:Mark G. Bock、Robert M. DiPardo、Ben E. Evans、Kenneth E. Rittle、Willie L. Whitter、Daniel F. Veber、Roger M. Freidinger、Raymond S. L. Chang、T. B. Chen、Victor J. Lotti
DOI:10.1021/jm00163a069
日期:1990.1
Tifluadom, a kappa-opioid agonist and cholecystokinin-A (CCK-A) receptor antagonist, was utilized as a model to prepare a series of 2-(aminomethyl)- and 3-(aminomethyl)-1,4-benzodiazepines. These compounds were tested in vitro as inhibitors of the binding of [125I]CCK to rat pancreas and guinea pig brain receptors. All compounds with IC50's less than 100 microM proved to have greater affinity for the CCK-A receptor, with the most potent analogue, 6e, having an IC50 of 0.16 microM. The benzodiazepines described in this study are simultaneously CCK-A and opioid receptor ligands. The ramification of this dichotomy on current concepts of peptide hormone action are discussed. These results further demonstrate the versatility of the benzodiazepine core structure for designing nonpeptide ligands for peptide receptors and the ability to fine-tune the receptor interactions of these benzodiazepines by appropriate structure modifications.
Human Somatostatin Receptor Specificity of Backbone-Cyclic Analogues Containing Novel Sulfur Building Units
hormone but not of insulin release. We report the synthesis, bioactivity, and structure-activity relationship studies of compounds related to 1. In these analogues, the lactam bridge of 1 was replaced by a backbone disulfide bridge. We present a novel approach for conformational constraint of peptides by utilizing sulfur-containing building units for on-resin backbone cyclization. These disulfide backbone